可以声明一个plug-in。在plug-in中声明常量并将其保存在ServletContext中

举例如下：

Constants.java:

package com.yourcompany.struts.constants;

import java.util.HashMap;

import java.util.Map;

public class Constants {

    public Map globalConstants;

    public Constants(){

        globalConstants = new HashMap();

        globalConstants.put("userName","Rolia");

        globalConstants.put("path",new java.util.Date());

    }

    public Map getGlobalConstants() {

        return globalConstants;

    }

    public void setGlobalConstants(Map globalConstants) {

        this.globalConstants = globalConstants;

    }

}

ConstantsPlugin.java:

package com.yourcompany.struts.constants;

import javax.servlet.ServletException;

import org.apache.struts.action.ActionServlet;

import org.apache.struts.action.PlugIn;

import org.apache.struts.config.ModuleConfig;

public class ConstantsPlugin implements PlugIn{

    public void destroy() {

    }

    public void init(ActionServlet servlet, ModuleConfig config) throws ServletException {

        Constants constants = new Constants();

        servlet.getServletContext().setAttribute("Constants", constants);

    }

}

struts-config.xml:

  <plug-in className="com.yourcompany.struts.constants.ConstantsPlugin" />

show.jsp:

    <bean:write name="Constants" property="globalConstants.userName"/> <br>

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